[imports checker] Fix deprecation warning from astroid 2.15.0

Author: Pierre-Sassoulas

pylint/checkers/imports.py

@@ -891,7 +891,7 @@ def _add_imported_module(self, node: ImportNode, importedmodname: str) -> None:
         if context_name == importedmodname:
             self.add_message("import-self", node=node)
 
-        elif not astroid.modutils.is_standard_module(importedmodname):
+        elif not astroid.modutils.is_stdlib_module(importedmodname):
             # if this is not a package __init__ module
             if base != "__init__" and context_name not in self._module_pkg:
                 # record the module's parent, or the module itself if this is